"Ordinary World" was previously released on Green Day's 2016 album Revolution Radio. The band re-recorded the song with Lambert specifically for their recent greatest hits project, which was released in mid-November.

Greatest Hits: God's Favorite Band features some of Green Day's best-loved songs, from the beginning of their career in 1991 to the release of Revolution Radio in 2016. The music and lyrics for "Ordinary World" were written by the band's lead singer, Billie Joe Armstrong.

"Ordinary World" is not Lambert's first time working with Armstrong: The pair performed together at the 2014 Grammy Awards, in an surprising-but-adorable tribute to the late Phil Everly. That night, they sang the Everly Brothers' 1960 hit "When Will I Be Loved."